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                        <header>
                            <h1 class="post-title">android 引入ffmpeg</h1>
                        </header>
                        <date class="post-meta meta-date">
                            2019年1月14日
                        </date>
                        
                        <div class="post-meta meta-category">
                            |
                            
                                <a href="http://www.kikt.top/categories/android">android</a>
                            
                        </div>
                        
                        
                        <div class="post-meta">
                            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span> 阅读</span></span>
                        </div>
                        
                        <div class="post-content">
                            <p>上篇介绍了如何 在 mac 系统下打包 ffmpeg 的 so</p>
<p>这篇介绍如何引入 so 到项目中</p>
<p>开发环境:</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">macos
android studio 3.2.1
ndk: 15.2.4203891
</code></pre></div><h2 id="新建一个工程">新建一个工程</h2>
<p>新建工程时,勾选 c++支持</p>
<p><img src="https://dev.azure.com/cjlspy/844861b8-ee45-48a3-b430-b974684baaaa/_apis/git/repositories/bf4da1c1-1cfa-4f54-8a75-745cce2b737c/items?versionDescriptor%5Bversion%5D=master&amp;path=%2F20190114171810.png&amp;versionDescriptor%5BversionOptions%5D=0&amp;versionDescriptor%5BversionType%5D=0&amp;resolveLfs=true&amp;%24format=octetStream&amp;api-version=5.0" alt="20190114171810.png"></p>
<h2 id="将文件复制到项目内">将文件复制到项目内</h2>
<p>需要复制的文件</p>
<pre><code>.h 头文件
so文件
</code></pre>
<p><img src="https://dev.azure.com/cjlspy/844861b8-ee45-48a3-b430-b974684baaaa/_apis/git/repositories/bf4da1c1-1cfa-4f54-8a75-745cce2b737c/items?versionDescriptor%5Bversion%5D=master&amp;path=%2F20190114172127.png&amp;versionDescriptor%5BversionOptions%5D=0&amp;versionDescriptor%5BversionType%5D=0&amp;resolveLfs=true&amp;%24format=octetStream&amp;api-version=5.0" alt="20190114172127.png"></p>
<p><img src="https://dev.azure.com/cjlspy/844861b8-ee45-48a3-b430-b974684baaaa/_apis/git/repositories/bf4da1c1-1cfa-4f54-8a75-745cce2b737c/items?versionDescriptor%5Bversion%5D=master&amp;path=%2F20190114172229.png&amp;versionDescriptor%5BversionOptions%5D=0&amp;versionDescriptor%5BversionType%5D=0&amp;resolveLfs=true&amp;%24format=octetStream&amp;api-version=5.0" alt="20190114172229.png"></p>
<p>在 cpp 中新建一个文件夹<code>include/ffmpeg</code> 把 include 中的文件夹复制到 ffmpeg 下</p>
<p>在 main 下新建文件夹<code>jniLibs</code>,把 so 文件复制到其中
<img src="https://dev.azure.com/cjlspy/844861b8-ee45-48a3-b430-b974684baaaa/_apis/git/repositories/bf4da1c1-1cfa-4f54-8a75-745cce2b737c/items?versionDescriptor%5Bversion%5D=master&amp;path=%2F20190114172435.png&amp;versionDescriptor%5BversionOptions%5D=0&amp;versionDescriptor%5BversionType%5D=0&amp;resolveLfs=true&amp;%24format=octetStream&amp;api-version=5.0" alt="20190114172435.png"></p>
<h2 id="修改-cmakelist">修改 CMakeList</h2>
<p>完整的<code>CMakeList.txt</code> 如下</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-nginx" data-lang="nginx"><span style="color:#75715e"># For more information about using CMake with Android Studio, read the
</span><span style="color:#75715e"># documentation: https://d.android.com/studio/projects/add-native-code.html
</span><span style="color:#75715e"></span>
<span style="color:#75715e"># Sets the minimum version of CMake required to build the native library.
</span><span style="color:#75715e"></span>
<span style="color:#66d9ef">cmake_minimum_required(VERSION</span> <span style="color:#ae81ff">3</span><span style="color:#e6db74">.4.1)</span>

<span style="color:#75715e"># Creates and names a library, sets it as either STATIC
</span><span style="color:#75715e"># or SHARED, and provides the relative paths to its source code.
</span><span style="color:#75715e"># You can define multiple libraries, and CMake builds them for you.
</span><span style="color:#75715e"># Gradle automatically packages shared libraries with your APK.
</span><span style="color:#75715e"></span>
<span style="color:#75715e">#
</span><span style="color:#75715e">#
</span><span style="color:#75715e"></span><span style="color:#e6db74">set(distribution_DIR</span> ${CMAKE_SOURCE_DIR}/src/main/jniLibs<span style="color:#e6db74">)</span>

<span style="color:#75715e">#
</span><span style="color:#75715e"></span>

<span style="color:#75715e">#set(FFDIR /Users/cai/code/c/ffmpeg-3.3.6/android/arm/lib)
</span><span style="color:#75715e"></span>
<span style="color:#e6db74">include_directories(</span>
        <span style="color:#e6db74">src/main/cpp/include/ffmpeg</span>
<span style="color:#e6db74">)</span>

<span style="color:#75715e"># ffmpeg 的library
</span><span style="color:#75715e"></span><span style="color:#e6db74">add_library(</span>
        <span style="color:#e6db74">avcodec</span>
        <span style="color:#e6db74">SHARED</span>
        <span style="color:#e6db74">IMPORTED</span>
<span style="color:#e6db74">)</span>
<span style="color:#e6db74">set_target_properties(</span>
        <span style="color:#e6db74">avcodec</span>
        <span style="color:#e6db74">PROPERTIES</span> <span style="color:#e6db74">IMPORTED_LOCATION</span>
        ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavcodec-57.so
<span style="color:#e6db74">)</span>

<span style="color:#e6db74">add_library(</span>
        <span style="color:#e6db74">avdevice</span>
        <span style="color:#e6db74">SHARED</span>
        <span style="color:#e6db74">IMPORTED</span>
<span style="color:#e6db74">)</span>
<span style="color:#e6db74">set_target_properties(</span>
        <span style="color:#e6db74">avdevice</span>
        <span style="color:#e6db74">PROPERTIES</span> <span style="color:#e6db74">IMPORTED_LOCATION</span>
        ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavdevice-57.so
<span style="color:#e6db74">)</span>

<span style="color:#e6db74">add_library(</span>
        <span style="color:#e6db74">avfilter</span>
        <span style="color:#e6db74">SHARED</span>
        <span style="color:#e6db74">IMPORTED</span>
<span style="color:#e6db74">)</span>
<span style="color:#e6db74">set_target_properties(</span>
        <span style="color:#e6db74">avfilter</span>
        <span style="color:#e6db74">PROPERTIES</span> <span style="color:#e6db74">IMPORTED_LOCATION</span>
        ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavfilter-6.so
<span style="color:#e6db74">)</span>

<span style="color:#e6db74">add_library(</span>
        <span style="color:#e6db74">avformat</span>
        <span style="color:#e6db74">SHARED</span>
        <span style="color:#e6db74">IMPORTED</span>
<span style="color:#e6db74">)</span>
<span style="color:#e6db74">set_target_properties(</span>
        <span style="color:#e6db74">avformat</span>
        <span style="color:#e6db74">PROPERTIES</span> <span style="color:#e6db74">IMPORTED_LOCATION</span>
        ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavformat-57.so
<span style="color:#e6db74">)</span>

<span style="color:#e6db74">add_library(</span>
        <span style="color:#e6db74">avutil</span>
        <span style="color:#e6db74">SHARED</span>
        <span style="color:#e6db74">IMPORTED</span>
<span style="color:#e6db74">)</span>
<span style="color:#e6db74">set_target_properties(</span>
        <span style="color:#e6db74">avutil</span>
        <span style="color:#e6db74">PROPERTIES</span> <span style="color:#e6db74">IMPORTED_LOCATION</span>
        ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavutil-55.so
<span style="color:#e6db74">)</span>


<span style="color:#e6db74">add_library(</span>
        <span style="color:#e6db74">swresample</span>
        <span style="color:#e6db74">SHARED</span>
        <span style="color:#e6db74">IMPORTED</span>
<span style="color:#e6db74">)</span>
<span style="color:#e6db74">set_target_properties(</span>
        <span style="color:#e6db74">swresample</span>
        <span style="color:#e6db74">PROPERTIES</span> <span style="color:#e6db74">IMPORTED_LOCATION</span>
        ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libswresample-2.so
<span style="color:#e6db74">)</span>

<span style="color:#e6db74">add_library(</span>
        <span style="color:#e6db74">swscale</span>
        <span style="color:#e6db74">SHARED</span>
        <span style="color:#e6db74">IMPORTED</span>
<span style="color:#e6db74">)</span>
<span style="color:#e6db74">set_target_properties(</span>
        <span style="color:#e6db74">swscale</span>
        <span style="color:#e6db74">PROPERTIES</span> <span style="color:#e6db74">IMPORTED_LOCATION</span>
        ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libswscale-4.so
<span style="color:#e6db74">)</span>

<span style="color:#75715e"># ffmpeg 的library end
</span><span style="color:#75715e"></span>
<span style="color:#75715e"># Searches for a specified prebuilt library and stores the path as a
</span><span style="color:#75715e"># variable. Because CMake includes system libraries in the search path by
</span><span style="color:#75715e"># default, you only need to specify the name of the public NDK library
</span><span style="color:#75715e"># you want to add. CMake verifies that the library exists before
</span><span style="color:#75715e"># completing its build.
</span><span style="color:#75715e"></span>
<span style="color:#e6db74">find_library(</span> <span style="color:#75715e"># Sets the name of the path variable.
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">log-lib</span>

        <span style="color:#75715e"># Specifies the name of the NDK library that
</span><span style="color:#75715e"></span>        <span style="color:#75715e"># you want CMake to locate.
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">log)</span>

<span style="color:#e6db74">add_library(</span> <span style="color:#75715e"># Sets the name of the library.
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">native-lib</span>

        <span style="color:#75715e"># Sets the library as a shared library.
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">SHARED</span>

        <span style="color:#75715e"># Provides a relative path to your source file(s).
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">src/main/cpp/native-lib.cpp</span>
        <span style="color:#e6db74">)</span>

<span style="color:#75715e"># Specifies libraries CMake should link to your target library. You
</span><span style="color:#75715e"># can link multiple libraries, such as libraries you define in this
</span><span style="color:#75715e"># build script, prebuilt third-party libraries, or system libraries.
</span><span style="color:#75715e"></span>
<span style="color:#e6db74">target_link_libraries(</span> <span style="color:#75715e"># Specifies the target library.
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">native-lib</span>

        <span style="color:#75715e"># ffmpeg 相关库
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">avcodec</span>
        <span style="color:#e6db74">avdevice</span>
        <span style="color:#e6db74">avfilter</span>
        <span style="color:#e6db74">avformat</span>
        <span style="color:#e6db74">avutil</span>
        <span style="color:#e6db74">swresample</span>
        <span style="color:#e6db74">swscale</span>
        <span style="color:#75715e">#
</span><span style="color:#75715e"></span>
        <span style="color:#75715e"># Links the target library to the log library
</span><span style="color:#75715e"></span>        <span style="color:#75715e"># included in the NDK.
</span><span style="color:#75715e"></span>        ${log-lib}<span style="color:#e6db74">)</span>

</code></pre></div><p>简单解释下:</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-nginx" data-lang="nginx"><span style="color:#75715e"># 设置so文件的目录
</span><span style="color:#75715e"></span><span style="color:#66d9ef">set(distribution_DIR</span> ${CMAKE_SOURCE_DIR}/src/main/jniLibs<span style="color:#e6db74">)</span>
</code></pre></div><div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-nginx" data-lang="nginx"><span style="color:#75715e"># 引入头文件
</span><span style="color:#75715e"></span><span style="color:#66d9ef">include_directories(</span>
        <span style="color:#e6db74">src/main/cpp/include/ffmpeg</span>
<span style="color:#e6db74">)</span>
</code></pre></div><div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-nginx" data-lang="nginx"><span style="color:#75715e">#视为一组
</span><span style="color:#75715e"></span>
<span style="color:#75715e"># 第一个为库名称,类型,已导入
</span><span style="color:#75715e"></span><span style="color:#66d9ef">add_library(</span>
        <span style="color:#e6db74">avcodec</span>
        <span style="color:#e6db74">SHARED</span>
        <span style="color:#e6db74">IMPORTED</span>
<span style="color:#e6db74">)</span>

<span style="color:#75715e"># 库名称, 属性名称, 文件路径
</span><span style="color:#75715e"></span><span style="color:#e6db74">set_target_properties(</span>
        <span style="color:#e6db74">avcodec</span>
        <span style="color:#e6db74">PROPERTIES</span> <span style="color:#e6db74">IMPORTED_LOCATION</span>
        ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libavcodec-57.so
<span style="color:#e6db74">)</span>
</code></pre></div><div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-nginx" data-lang="nginx"><span style="color:#75715e"># 这两个是新建项目时自带的, 这个应该是ndk中的库
</span><span style="color:#75715e"></span><span style="color:#66d9ef">find_library(</span> <span style="color:#75715e"># Sets the name of the path variable.
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">log-lib</span>

        <span style="color:#75715e"># Specifies the name of the NDK library that
</span><span style="color:#75715e"></span>        <span style="color:#75715e"># you want CMake to locate.
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">log)</span>

<span style="color:#e6db74">add_library(</span> <span style="color:#75715e"># Sets the name of the library.
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">native-lib</span>

        <span style="color:#75715e"># Sets the library as a shared library.
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">SHARED</span>

        <span style="color:#75715e"># Provides a relative path to your source file(s).
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">src/main/cpp/native-lib.cpp</span>
        <span style="color:#e6db74">)</span>

</code></pre></div><div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-nginx" data-lang="nginx"><span style="color:#75715e"># 最后是连接到项目中
</span><span style="color:#75715e"></span><span style="color:#66d9ef">target_link_libraries(</span> <span style="color:#75715e"># Specifies the target library.
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">native-lib</span>

        <span style="color:#75715e"># ffmpeg 相关库
</span><span style="color:#75715e"></span>        <span style="color:#e6db74">avcodec</span>
        <span style="color:#e6db74">avdevice</span>
        <span style="color:#e6db74">avfilter</span>
        <span style="color:#e6db74">avformat</span>
        <span style="color:#e6db74">avutil</span>
        <span style="color:#e6db74">swresample</span>
        <span style="color:#e6db74">swscale</span>
        <span style="color:#75715e">#
</span><span style="color:#75715e"></span>
        <span style="color:#75715e"># Links the target library to the log library
</span><span style="color:#75715e"></span>        <span style="color:#75715e"># included in the NDK.
</span><span style="color:#75715e"></span>        ${log-lib}<span style="color:#e6db74">)</span>

</code></pre></div><p>作用解释没有那么准确,大概理解意思就行</p>
<h2 id="修改-cppkotlin-文件">修改 cpp/kotlin 文件</h2>
<p>新建项目时会有一个 cpp 文件,</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-cpp" data-lang="cpp"><span style="color:#75715e">#include</span> <span style="color:#75715e">&lt;jni.h&gt;</span><span style="color:#75715e">
</span><span style="color:#75715e">#include</span> <span style="color:#75715e">&lt;string&gt;</span><span style="color:#75715e">
</span><span style="color:#75715e"></span>
<span style="color:#75715e">// 这里的导入是我们新建的
</span><span style="color:#75715e"></span><span style="color:#66d9ef">extern</span> <span style="color:#e6db74">&#34;C&#34;</span> {
<span style="color:#75715e">#include</span> <span style="color:#75715e">&lt;libavutil/log.h&gt;</span><span style="color:#75715e">
</span><span style="color:#75715e">#include</span> <span style="color:#75715e">&lt;libavformat/avformat.h&gt;</span><span style="color:#75715e">
</span><span style="color:#75715e"></span>}

<span style="color:#66d9ef">extern</span> <span style="color:#e6db74">&#34;C&#34;</span> JNIEXPORT jstring JNICALL
Java_top_kikt_ffmpegandroidexample_MainActivity_stringFromJNI(
        JNIEnv <span style="color:#f92672">*</span>env,
        jobject <span style="color:#75715e">/* this */</span>) {
    std<span style="color:#f92672">::</span>string hello <span style="color:#f92672">=</span> <span style="color:#e6db74">&#34;Hello from C++&#34;</span>;
    <span style="color:#66d9ef">return</span> env<span style="color:#f92672">-&gt;</span>NewStringUTF(hello.c_str());
}


<span style="color:#75715e">// 这里是我们自己新建的方法
</span><span style="color:#75715e"></span><span style="color:#66d9ef">extern</span> <span style="color:#e6db74">&#34;C&#34;</span> JNIEXPORT jint JNICALL
Java_top_kikt_ffmpegandroidexample_MainActivity_dumpInfo(
        JNIEnv <span style="color:#f92672">*</span>env,
        jobject) {

    av_log_set_level(AV_LOG_DEBUG);
    av_register_all();

    <span style="color:#66d9ef">return</span> <span style="color:#ae81ff">1</span>;
}
</code></pre></div><p>有 2 个方法,第二个是我们自定义的, 导包部分引入了 avutil 和 avformat 的头文件</p>
<p>这里有一点要格外注意 <code>extern &quot;C&quot;</code> 我们必须要用这个,这个是在 cpp 中使用 c 文件的必备方法</p>
<p>不然在运行时会报错,当然如果你本身是 c 文件就不存在这个问题了</p>
<hr>
<p>然后修改 kotlin 文件</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-kotlin" data-lang="kotlin"><span style="color:#66d9ef">package</span> top.kikt.ffmpegandroidexample

<span style="color:#66d9ef">import</span> android.os.Bundle
<span style="color:#66d9ef">import</span> android.support.v7.app.AppCompatActivity
<span style="color:#66d9ef">import</span> kotlinx.android.synthetic.main.activity_main.*

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MainActivity</span> : AppCompatActivity() {

    <span style="color:#66d9ef">override</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">onCreate</span>(savedInstanceState: Bundle?) {
        <span style="color:#66d9ef">super</span>.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        <span style="color:#75715e">// Example of a call to a native method
</span><span style="color:#75715e"></span>        sample_text.text = stringFromJNI()

        sample_text.text = dumpInfo().toString()
    }

    <span style="color:#75715e">/**
</span><span style="color:#75715e">     * A native method that is implemented by the &#39;native-lib&#39; native library,
</span><span style="color:#75715e">     * which is packaged with this application.
</span><span style="color:#75715e">     */</span>
    <span style="color:#66d9ef">external</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">stringFromJNI</span>(): String

    <span style="color:#66d9ef">external</span> <span style="color:#66d9ef">fun</span> <span style="color:#a6e22e">dumpInfo</span>(): Int

    <span style="color:#66d9ef">companion</span> <span style="color:#66d9ef">object</span> {

        <span style="color:#75715e">// Used to load the &#39;native-lib&#39; library on application startup.
</span><span style="color:#75715e"></span>        init {
            System.loadLibrary(<span style="color:#e6db74">&#34;native-lib&#34;</span>)
            System.loadLibrary(<span style="color:#e6db74">&#34;avformat&#34;</span>)
            System.loadLibrary(<span style="color:#e6db74">&#34;avutil&#34;</span>)
        }
    }
}

</code></pre></div><p>这里可以看到我们输出的内容来源于自己新建的内容 dumpInfo 会调用到刚刚在 cpp 中定义的第二个方法,并且运行时 loadLibrary 也没有报找不到 so 的异常, 这就说明成功了</p>
<h2 id="后记">后记</h2>
<p>本篇在 android 项目中引入了 ffmpeg ,完成了这一步的跨越后,很多 ffmpeg 的功能就可以自己写 jni 方法来调用了!</p>
<p>比如直播,滤镜,yuv 处理等等,依托于 ffmpeg 强大的生态,音视频领域可以说有大半可做了!</p>

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<div class="post-archive">
    <h2>See Also</h2>
    <ul class="listing">
        
        <li><a href="/posts/android/android-ffmpeg-compile-so/">ndk编译ffmpeg</a></li>
        
        <li><a href="/posts/flutter/android/finish-activity/">Finish FlutterActivity 源码解析</a></li>
        
        <li><a href="/posts/flutter/channel/flutter-channel2/">Flutter 原生通信 (二) - Android通知Flutter</a></li>
        
        <li><a href="/posts/flutter/channel/flutter-channel1/">Flutter 原生通信 (一) - flutter调用Android</a></li>
        
        <li><a href="/posts/flutter/so-about-1/">flutter android So库对齐</a></li>
        
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